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- W4366774454 abstract "The N2 flowing microwave discharges have been investigated by emission spectroscopy in the following conditions: N2 at p = 5 Torr, flow rate of 0.3 slpm, t = 1.5×10-3 s and microwave power of P = 150 W. The plasma and pink afterglows have been analysed in a setup where the end of the plasma (produced inside a 5 mm ext. dia. tube) was directly connected to a larger post-discharge tube (with a diameter of 15 mm). Under these conditions, the production of N2+ ions in the plasma and in the early afterglow is done predominantly by electron collisions. After the end of the plasma up to the pink afterglow, N2(A) and N2(X,v>11) were the excited species at the origin of the N2(C) and N2+(B) emissions. A self-consistent theoretical model was introduced to explain the production of the N2 active species by particle kinetics. The intensity ratio increased 15 times from the plasma to the pink afterglow. In this setup, the gas temperature was about 1000 K in the plasma and 700 K in the pink afterglow. In a second setup, the plasma end was at 12 cm of the post-discharge tube. The gas temperature was lower: 750 K at 2 cm and 400 K at the plasma end (3.5 cm). The effect of adding an Ar-NOext gas mixture (used for N-atom titration in the late afterglow inside the 15 mm diameter tube) at the discharge end was studied along the 5 mm diameter tube. It was concluded first that the destruction of N-atoms by NOext decreased the intensity of the N(2P) and N2(B) radiative states. Second, the electrons at the plasma end could excite the N2(C) and N2+(B) radiative states." @default.
- W4366774454 created "2023-04-25" @default.
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- W4366774454 date "2023-04-20" @default.
- W4366774454 modified "2023-09-30" @default.
- W4366774454 title "N2 Active Species in Microwave Plasma and Early Afterglows at Low Gas Pressure" @default.
- W4366774454 doi "https://doi.org/10.9734/bpi/mono/978-81-19217-08-3/ch24" @default.
- W4366774454 hasPublicationYear "2023" @default.
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